How to enable Canned Responses in Gmail

Compose an email message you’d like to use over and over again, and then click the arrow in the lower right-hand corner of the message window.

The next time someone emails you something that warrants the canned response you created, reply to the message and instead of typing your response, click the arrow button in the lower right-hand corner, select Canned Responses, and then under Insert, choose the canned response you created in the previous step. You’ll then see your response appear in the body of your reply.